# Sam Chak

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**Content Feed**

How to convert symbolic transfer function to state space?

Hi @Ali Almakhmari I am uncertain about your intention regarding the symbolic state-space. The state-space object from the Cont...

7 hours ago | 0

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Solving 4 nonlinear equation for 4 unknowns numerical - doesn't find an answer [0×1 sym]

Hi @Faraz j Fixing the vpasolve() syntax does return some complex-valued solutions, with their real parts close to the values o...

9 hours ago | 0

How to fix such type of problem ?

Hi @Assen Beshr Correct me if I interpreted your problem incorrectly. If you want to maximize the real part of the stabilizing ...

9 hours ago | 0

Time responses of the steering angle

Hi @Nguyen Finding the values to plot the graph is less useful than having a reliable algorithm to determine the steering angle...

10 hours ago | 0

Second order approximation of a third order system

Hi @Keaton Looper For versions before R2023b release, use the balred() command. Now you can use the newer reducespec() command ...

12 hours ago | 0

how to see training, validation and test regression lot in ANN

Hi @Sunita Here is an example using the plotregression() command. x = 0:10; targs1 = x.^2; outs1 = targs1 + 7*randn(1...

16 hours ago | 0

| accepted

How do I obtain the bode plot of the given transfer function?

Hi @bebo You need to improve your skills in identifying math operators. There are many missing '*' operators % Parameters of t...

21 hours ago | 0

can I ask a several question about automatic control ?

Hi @영석 윤 When a differential equation is given, modeling a system in Simulink requires converting the equation into integral fo...

21 hours ago | 0

Water Storage Tank Modelling

Hi @Abdelmoniem Abomosalam Your question is quite broad, so I recommend starting with the modeling of water tank level control....

1 day ago | 0

Modeling a water tank system using h(t)

Hi @Maria The equation you showed, , is actually the analytical solution of a 1st-order linear system that exhibits an exponent...

3 days ago | 0

please help me to this error "Derivative of state '1' in block 'ex/Integrator1' at time 1.3765443114784894 is not finite. The simulation will be stopped. There may be a sing

Hi, your system is unstable and it grows without bound, thus making the simulation stops. Check the formulas of each Gain block....

3 days ago | 0

Root Locus Plot Is Way Off

Hi @Walter Roberson Based on the description from the OP, the compensated system should form a closed-loop system. The formula ...

3 days ago | 0

Root Locus Plot Is Way Off

Hi @Arpad It seems that employing the place() command is a more efficient approach to solving the pole placement problem. I wil...

3 days ago | 0

Root Locus Plot Is Way Off

Hi @Arpad I am uncertain about what your professor intends for you to learn. Initially, the problem seems akin to a standard Po...

3 days ago | 0

Tune FIS with Training Data

Hi @Ahmad Long story short, the MATLAB data file 'tunedfismpgprediction.mat' contains 2 pre-trained FIS files because this is a...

5 days ago | 1

| accepted

Please help. The first input argument of the "tf" command cannot be a string.

Hi @Melissa Variable K doesn't a specific value, I want multiply K other variables like TR2... From the root locus, it appear...

6 days ago | 0

Lotka volterra model for 3 species (1 prey - 2 predators)

Hi @José Manuel This isn't strictly a MATLAB-related question, but I believe animal behaviorists might be able to advise you. A...

6 days ago | 1

PID simulation for heating with heat pump

Hi @Branko What is the best way to simulate the system and ... If you are a newbie, I'd recommend modeling the system in Simul...

6 days ago | 1

transfer function zeros are more than poles

Hi @aiman You can try these configurations (2 methods). Both should produce nearly the same output signals.

7 days ago | 1

| accepted

Plotting issue where the curve is missing

Hi @Lutfi The reason is that Phi_b is a constant, and time is a vector. They don't have the same dimension. Phi_b = (1 - 0.930...

7 days ago | 2

Plot interval in y

Hi @Maria The ylim() command can be used to set the interval on the y-axis. x = -1:0.01:1; y = x.^3 - 0.25*x.^2 - 0.5*x; f...

8 days ago | 1

| accepted

Inverse Laplace transform of a 4 by 4 matrix

Hi @Sunday Aloke Since this is a linear dynamic system described in state-space, the output can be found using the dsolve() com...

8 days ago | 0

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particle swarm optimization code to minimize cost function

Hi @REENA Regarding the particleswarm() solver, I believe you can define constraints using the Problem-Based Optimization appro...

8 days ago | 0

How would I plot this and then achieve minimum and maximum.

Hi @Tom The cubic function does not have global extrema, but it does have a local maximum point and a local minimum point. Are ...

8 days ago | 1

ode45 errorI have

Some corrections in the ODE function (ODAYRK1) Tol = 1e-12; Tol0 = 1e-9; tspan = [0 10]; options = odeset('RelTol',...

9 days ago | 0

Find zeropoints with interpolation

Hi @malik abdelli Check this out to see if this approach, using the zerocrossrate() function, is acceptable for finding the ind...

9 days ago | 1

Help With for loop with tranfer function and step

Hi @Davide Cannavacciuolo You probably want to plot like this: s = tf('s'); G = 1/(s^2 + 0.4*s + 0.1); K = [1 2 3 4 5 6]; ...

10 days ago | 0

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How to type sin function with square

@John Sanjai J, are you expecting this? syms x expr = sin(x)^2

10 days ago | 0

What is the function to use to find the intersection of two graphs?

Hi @Lê It is possible to find intersections using the fsolve() command. f = @(x,y) y - 2 - (x.^2).*cos(x); fimplicit(f), grid...

10 days ago | 0

Solve ODE without initial condition

Hi @sudhir I also couldn't obtain the analytical solution using dsolve(). However, when I tested this problem on Wolfram Alpha,...

10 days ago | 0